【简答题】在△ABC中,角A、B、C的对边分别是 、b、c。若 ,则 A、1 B、2 C、 D、
【简答题】在△ABC中,a、b、c分别是△ABC内角 A、B、C的对边,且满足bcosC=2acosB-ccosB。 (1)求内角B的大小; (2)求cosA+cosC的取值范围。
【多选题】下列各项中,影响企业利润总额的有( )。
【简答题】Directions: Listen to the passage and fill in the blanks with the exact words you ’ve heard . My dream is to go mountain biking in the French Alps someday. The area is famous for its 1. , and I hear t...